Thermal pyrolysis apparatus

ABSTRACT

A thermal pyrolysis apparatus includes at least one pyrolysis device. The pyrolysis device includes an inlet, an outlet and a pyrolysis chamber. A conveying unit is provided in the pyrolysis chamber. The pyrolysis device has a casing with thermal oil circulated in the casing. An oil gas collecting unit is disposed on top of the casing and interconnected with the pyrolysis chamber. The pyrolysis chamber of the present invention provides a better closed effect, which can be heated evenly and won&#39;t be oxidized easily. The present invention can be applied to recycle waste rubbers or waste tires.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a thermal pyrolysis apparatus, and moreparticularly to one having a pyrolysis device to decompose waste rubbersor waste tires efficiently to produce carbon power and gas afterpyrolysis.

2. Description of the Prior Art

Because industry and commerce are greatly developed, vehicles are veryimportant for people. After a period of time, the tires of vehicles willharden and the grooves on the tires will suffer a lot of wear and tear,which may influence the function of the tires. Therefore, the tires haveto be discarded after being used for a period of time. More and morewaste tires are discarded without concern, which may occupy a lot ofspace. Furthermore, the waste tires are not easy to be decomposed.Sometimes, the tires may bring poisonous substances if they were burnedcarelessly.

As known in the prior art, the waste tires can be recycled forprocessing and pyrolysis. In fact, the waste tires have a certaineconomical value, such as oil, carbon black, gas, and steel wires.

To deal with the pyrolysis of the waste tires is in the condition of nooxygen or less oxygen. By using thermal energy to decompose the wastetires, the diesel oil, residual oil, carbon black, other gas and residueof the waste tires can be separated out. The waste tires must be cutinto pieces and conveyed to a pyrolysis chamber for proceeding pyrolysisin order to produce carbon black, residual oil and the like.

A conventional pyrolysis apparatus cannot be heated evenly. Some areasare heated over and others are heated insufficiently, which may causethat some waste tire pieces become hardened and some waste tire piecescannot be decomposed.

SUMMARY OF THE INVENTION

The primary object of the present invention is to provide a thermalpyrolysis apparatus in a closed configuration, which can be heatedevenly and won't be oxidized easily for the material to be decomposed.

According to the present invention, there is provided a thermalpyrolysis apparatus comprising a feed device, a conveying device, atleast one pyrolysis device, and a discharge device.

Preferably, the pyrolysis device includes an inlet, an outlet and apyrolysis chamber. A conveying unit is provided in the pyrolysischamber. The pyrolysis device has a casing with thermal oil circulatedin the casing. An oil gas collecting unit is disposed on top of thecasing and interconnected with the pyrolysis chamber.

Preferably, the conveying unit in the pyrolysis chamber is a spiral rodwhich is transversely disposed in the pyrolysis chamber to stir andconvey waste tire fragments from on end to an opposite end of thepyrolysis chamber in a spiral manner. The waste tire fragments can berepeatedly stirred and heated evenly, providing a better pyrolysiseffect.

Preferably, the gas collected by the oil gas collecting unit can bereused after the waste tire fragments are decomposed sufficiently, sothat the waste tires can be recycled.

Preferably, the pyrolysis chamber is surrounded by the casing and thecasing has thermal oil circulated therein. Compared to the prior art,the present invention can be heated evenly to provide a better pyrolysiseffect.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view of a preferred embodiment of the presentinvention; and

FIG. 2 is a schematic view of the preferred embodiment of the presentinvention when in use.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Embodiments of the present invention will now be described, by way ofexample only, with reference to the accompanying drawings.

As shown in FIG. 1, a thermal pyrolysis apparatus according to apreferred embodiment of the present invention comprises a feed device 1,a conveying device 2, a first pyrolysis device 3, a second pyrolysisdevice 4, and a discharge device 5.

The feed device 1 comprises an inlet 11, a conveying member 12 and amotor 13. Waste tire fragments can be conveyed from the inlet 11 to anoutlet 14 through the conveying member 12.

The conveying device 2 comprises an inlet 21, a conveying member 22 anda motor 23. The inlet 21 is located under the outlet 14. The conveyingmember 22 is located under the inlet 21 to convey the waste tirefragments to an outlet 24 which is located at a rear end of theconveying device 2.

The first pyrolysis device 3 has a first inlet 31 which is connectedwith the outlet 24. The first pyrolysis device 3 comprises a firstcasing 33. The first casing 33 has a first thermal oil input end 331 anda first thermal oil output end 332, such that the thermal oil can becirculated in the first casing 33. The first casing 33 has a firstpyrolysis chamber 34 therein. The first pyrolysis chamber 34 istransversely disposed in the first casing 33. A first conveying unit 35is provided in the first pyrolysis chamber 34. The first conveying unit35 is a spiral rod which is transversely disposed in the first pyrolysischamber 34 and connected with a motor 37 to stir and convey the wastetire fragments from the first inlet 31 to an opposite end. A first oilgas collecting unit 36 is provided on top of the first casing 33 andinterconnected with the first pyrolysis chamber 34 so as to collect theoil gas in the first pyrolysis chamber 34. The first oil gas collectingunit 36 has a first air vent 361. The first casing 33 has a first outlet32 which is disposed at a bottom of the first casing 33 opposite to thefirst inlet 31.

The second pyrolysis device 4 is connected with a rear end of the firstpyrolysis device 3 and located under the pyrolysis device 3. The secondpyrolysis device 4 has a second inlet 41 which is connected to the firstoutlet 32 and located under the first outlet 32, so that the materialdischarged from the first outlet 32 can direct enter the secondpyrolysis device 4 through the second inlet 41. The structure of thesecond pyrolysis device 4 is substantially identical to that of thefirst pyrolysis device 3. The second pyrolysis device 4 comprises asecond casing 43. The second casing 43 has a second thermal oil inputend 431 and a second thermal oil output end 432, such that the thermaloil can be circulated in the second casing 43. The second casing 43 hasa second pyrolysis chamber 44 therein. The second pyrolysis chamber 44is transversely disposed in the second casing 43. A second conveyingunit 45 is provided in the second pyrolysis chamber 44. The secondconveying unit 45 is a spiral rod which is transversely disposed in thesecond pyrolysis chamber 44 and connected with a motor 47 to stir andconvey the waste tire fragments from the second inlet 41 to an oppositeend. A second oil gas collecting unit 46 is provided on top of thesecond casing 43 and interconnected with the second pyrolysis chamber 44so as to collect the oil gas in the second pyrolysis chamber 44. Thesecond oil gas collecting unit 46 has a second air vent 461. The secondcasing 43 has a second outlet 42 which is disposed at a bottom of thesecond casing 43 opposite to the second inlet 41.

The discharge device 5 comprises a terminal funnel 51, a terminalconveying member 52 under the funnel 51 and a motor 53 to send out thematerial.

As shown in FIG. 2, the waste tire fragments with catalyst are placedinto the feed device 1 to be delivered to the first pyrolysis device 3through the conveying device 2. Because the thermal oil is circulated inthe first casing 33, the temperate in the first pyrolysis chamber 34 canbe risen to about 500 degrees centigrade. Because the first pyrolysischamber 34 is in a closed status, the waste tire fragments are stirredand conveyed by the first conveying unit 35 which is transverselydisposed in the first pyrolysis chamber 34. The waste tire fragments canbe thermal decomposed in the condition of no oxygen to collect the oilgas form the waste tire fragments through the first oil gas collectingdevice 36. The remnant carbon black materials are sent to the secondpyrolysis device 4 from the first outlet 32 for the second pyrolysis.The oil gas decomposed by the second pyrolysis is collected through thesecond oil gas collecting device 46 and then to be sent out. The lastremnant is carbon powder which is sent out through the second outlet 42and the discharge device 5 and can be used for other purposes.

The present invention uses two series pyrolysis devices to provide aperfect pyrolysis effect and conform to the demand of carbon black.

Although particular embodiments of the present invention have beendescribed in detail for purposes of illustration, various modificationsand enhancements may be made without departing from the spirit and scopeof the present invention. Accordingly, the present invention is not tobe limited except as by the appended claims.

1. A thermal pyrolysis apparatus, comprising at least one pyrolysisdevice, the pyrolysis device comprising: a casing, the casing having athermal oil input end and a thermal oil output end for thermal oil to becirculated in the casing; a pyrolysis chamber, the pyrolysis chamberbeing transversely disposed in the casing; a conveying unit, theconveying unit being a spiral rod which is transversely disposed in thepyrolysis chamber; an oil gas collecting unit, the oil gas collectingunit being disposed on top of the casing and interconnected with thepyrolysis chamber, the oil gas collecting unit having an air vent; andan inlet and an outlet, the inlet and the outlet being disposed at twoends of the pyrolysis chamber, respectively.
 2. The thermal pyrolysisapparatus as claimed in claim 1, wherein a conveying device is providedat a front end of the inlet of the pyrolysis device, the conveyingdevice comprising an inlet, a conveying member under the inlet, a motorand an outlet which is connected with the inlet of the pyrolysis device.3. The thermal pyrolysis apparatus as claimed in claim 2, wherein a feeddevice is provided at a front end of the inlet of the conveying device,the feed device comprising a conveying member, an inlet and an outletbeing disposed at two ends of the conveying member of the feed devicerespectively, the outlet of the feed device being located above theinlet of the conveying device.
 4. The thermal pyrolysis apparatus asclaimed in claim 1, wherein the outlet of the pyrolysis device isconnected with a discharge device, the discharge device comprising aterminal funnel which is connected with the outlet of the pyrolysisdevice and a terminal conveying member which is located under theterminal funnel.
 5. The thermal pyrolysis apparatus as claimed in claim1, comprising two or more than two pyrolysis devices which are connectedone by one, wherein the outlet of a front pyrolysis device is connectedto the inlet of a rear pyrolysis device.